Garmin updates

I updated 2 Garmin Astros 220's (1 mine, 1 my buddies) to the latest software upgrade. I also updated 3 of the 4 DC-30's to the newest software for the DC-30. I loaded all 4 collars into both ASTRO's. Tonight when I got home, I turned everything on. The 3 upgraded collars triple blinked meaning the had great reception. We drove away from our house at a slow rate of speed. At around 1 mile as the crow flies from the collars, I began loosing reception on the collar that was not updated. The 3 that were updated were loosing and picking back up signal at 1.51 miles. Tara and Emily wanted to get back home, so we stopped our research for the night. I saw enough of a difference to recommend updating your equipment. I will update the last collar tomorrow.